Remove 'photonstorm.zip'

This is removed for the same reason you remove compiled binaries from
Git.

In the future, this zip will instead be compiled automatically for each
release.
Remove 'Flixel Versions' and replace with SWC of current Flixel version
Move 'Test Suite' to separate branch, while moving actual code to 'src'
Move 'Docs' to separate branch
Fix repository structure

Now it's more like other Git repositories, but more importantly, easier to manage.